Why is infrared much better than visible light in studying star formation?
What will be an ideal response?
Before the protostar begins shining, it will heat enough to glow red, but this radiation is hidden behind a shroud of dust that absorbs light, but not heat. Thus the dark nebula often have heat sources imbedded within them that someday will crawl out of the womb and shine as stars as well.
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The oldest-known smelted iron dates to approximately what year?
(a) 27,000 BCE (b) 6000 BCE (c) 2500 BCE (d) 1000 BCE
The spectra of interstellar gas clouds show that they have the same basic composition as:
A) interstellar dust. B) Earth's atmosphere. C) stars. D) asteroids. E) the Martian polar caps.
Extraterrestrial life is defined to be
A) life found beyond the Earth which is based on the same biology and chemistry as life on Earth B) advanced life forms that have visited the Earth C) any kind of life found beyond the Earth D) advanced life found on Earth-like planets around other stars
The two principal agents of metamorphism are pressure and ______________
Fill in the blank(s) with correct word